Antidieseling device for internal combustion engines

ABSTRACT

An automatic device and method to prevent dieseling from occurring within an internal combustion engine after ignition shutoff by introducing a sudden stream of air onto the idle fuel chamber of the engine&#39;&#39;s carburetor, thereby producing a &#39;&#39;&#39;&#39;lean&#39;&#39;&#39;&#39; fuel mixture, making it unable to burn within the engine.

United States Patent Gannoe 451 Jan. 18, 1972 [54] ANTIDIESELING DEVICE FOR MNTERNAL COMBUSTION ENGINES Thomas E. Gannon, Warren, Pa.

Assignee: Sylvania Electric Products Inc.

Filed: July'27, 1970 Appl. No.: 58,392

Inventor:

11.5. C1. ..l123/l98 D, 123/97, 123/142, 123/D1G. 1 1 Int. Cl ..F02m 7/06, F02m 7/00, F02d 31/00 Field of Search ..123/97 B, 142, DIG. 11, 198 D, 123/ 198 DB [56] References Cited UNITED STATES PATENTS 1,751,322 3/1930 Grauel ..123/97 B 3,482,557 12/1969 Delarue et a1. 123/97 B 3,491,737 1/1970 Burnia ..123/198 DB 3,577,966 5/1971 Collingwood ..123/97 B Primary Examiner-Wendell E. Burns Attorney-Norman J. OMalley, Donald R. Castle and William H. McNeil] [57] ABSTRACT An automatic device and method to prevent dieseling from occurring within an internal combustion engine after ignition shutoff by introducing a sudden stream of air onto the idle fuel chamber of the engines carburetor, thereby producing a lean" fuel mixture, making it unable to burn within the engine.

6 Claims, 3 Drawing Figures IIIIIIIIH PATENTED JAN 1 a 1972 INVENTOR. THOMAS E. GANNOE ATTORNEY ANTIDIESELING DEVICE FOR INTERNAL COMBUSTION ENGINES BACKGROUND OF THE INVENTION This invention relates to internal combustion engines and more particularly to a device for preventing such engines from dieseling after ignition shutoff.

One common problem affecting internal combustion engines, particularly those used in automobiles, has been the occurrence of dieseling after the ignition has been turned off. Dieseling, in effect, is the ability of the engine to continue operating despite the absence of spark provided by the engine's spark plugs. It occurs primarily after the engine has been operated for a long period of time and is caused by heated sources within the engines cylinder compartments, which are capable of igniting the fuel mixture drawn into these cylinders by the vacuum of the intake manifold. Two examples of such sources are overheated spark plugs and scraps of stray incandescent carbon, which tend to build up within the cylinder walls overa period of time. It is, therefore, believed that a simple device and method which prevents dieseling in an internal combustion engine after ignition shutoff would be an advancement in the art.

OBJECTS AND SUMMARY OF THE INVENTION It is, therefore, a primary object of this invention to provide a device which will prevent dieseling from occurring within an internal combustion engine after ignition shutoff.

It is a further object of this invention to provide a device which is readily adaptable to engines currently is use, without the necessity of extensively redesigning the engine or its components.

It is still a further object of this invention to provide a device which facilitates ease of design, thereby substantially reducing the possibility of mechanical failure.

It is yet another object of this invention to provide a device which is entirely automatic in operation.

In accordance with one aspect of this invention there is provided a device having a receptacle body for receiving and maintaining a sample of air. This body has an air intake port, a vacuum port, and an air escape port. Within the body, a first piston member is adapted for movement between the air escape port and the vacuum port. Also within the body is a second piston member adapted to allow the sample of air from the air intake port to move over it but not to return and instead escape through the air escape port.

In accordance with an additional aspect of this invention, there is provided a method of preventing dieseling within an internal combustion engine whereby a sample of air is drawn into a common receptacle and maintained there during the operation of the engine. This air is forced out of the receptacle into the idle fuel chamber of the carburetor of the internal combustion engine shortly after ignition shutoff. This sample of air thus provides a noncombustible air-fuel mixture to the cylinders of the engine.

For a better understanding of the present invention, together with other and further objects, advantages and capabilities thereof, reference is made to the following specification and appended claims in connection with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. I is an elevational view of a carburetor with the present invention mounted thereon.

FIG. 2 is a longitudinal sectional view showing the respective positions of the internal components of the invention as the engine is operating.

FIG. 3 is a longitudinal sectional view showing the respective positions of the internal components of the invention shortly after ignition shutoff.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As forementioned, there is provided a method whereby air is drawn into a receptacle body, maintained there during engine operation, and forcibly released shortly after ignition shutoff. This receptacle body has in air intake port which, because clean air is desired, can be attached to the air cleaner of the engine.

The receptacle body also has an air escape port from which air is discharged into the idle fuel chamber of the engine's carburetor. Also located on the receptacle body is a vacuum port which, because suction is required during engine operation, can be attached to the intake manifold of the engine. To more fully illustrate the previously described method, a detailed description of the drawings is provided.

Referring first to FIG. 11, there is shown a carburetor 11 which is mounted on an intake manifold 13 of an internal combustion engine. Air cleaner I5 is attached to carburetor 11 to purify air being drawn into the carburetor throat 29 by the vacuum created within the intake manifold I3. Fuel is fed into the float bowl 17 of carburetor II through pipe 19 from the engines fuel pump (not shown). Throttle valve 21, arm 23, and throttle rod 25, all being connected, are in turn connected to the engine's accelerator (not shown) which deter mines the operating speed of the engine.

During normal engine idling, the vacuum of the intake manifold 13 draws fuel from the carburetor float bowl 17 through idle fuel chamber 27 and into the carburetor throat 29, where it is mixed with the air, this mixture in turn being drawn into the manifold I3 to eventually be exploded within the engines cylinder walls. A screw 311 is used for adjusting the rate of fuel flow and consequently, the idling speed of the engine. a

Also shown in FIG. 1 is the antidieseling device 33 which is the subject of this invention. The device is mounted to the engine by a bracket 35 which encompasses the receptacle body 37 of the device and is affixed to the carburetor base by-bolt 39. Device 33 has an air escape port 41, an air intake port 43, and a vacuum port 45. Air escape port 41 is attached to extension 28 of the carburetor idle fuel chamber 27 by holes 47. The air intake port 43 is connected to a fitting 16 on air cleaner 15 by hose 49, so that during normal engine operation, air can be drawn into receptacle body 37. Vacuum port 45 is joined to a fitting I4 on the intake manifold by hose 51.

FIGS. 2 and 3 show the antidicseling device 33 in section so that the positions of the internal components may be seen during engine idling and ignition shutoff respectively.

Referring with greater detail to FIG. .2, receptacle body 37 is shown to house first piston member 53. Encompassing first piston member 53 is an O-ring 55, which in addition to providing a substantially airtight fit with-the interior wall 38 of the receptacle body 37 also provides a means by which less surface to surface contact is made during piston movement, thereby reducing the amount of friction encountered during such movement. On rear side 57 of first piston 53 is affixed the end of a spring 59, the other end being affixed to internal rear wall 61. Vacuum port 45 is shown attached to hose 51. During engine idling, the vacuum within the intake manifold 13 will provide sufficient suction to maintain first piston member 53 compressed against spring 59, as is shown in FIG. 2.

At the other end of receptacle body 37 can be seen second piston member 63 which is attached to rod 65, which slides within channel 44 of air intake port 43. Second piston member 63 also has a pliable lip 69 which is affixed to a metallic plate 71. To control the amount of movement of second piston member 63, a screw 67 is affixed within IIOd 65. This screw extends through slot 42 of air intake port 43 and is restrained in its lateral movement by the dimensions of this slot.

Air escape port 411 has a hollowed portion 73 which houses spherical body 75. A spring 77 is positioned within hollowed portion 73 so as to apply enough downward force to cause spherical body 75 to block air passage 79 thereby prohibiting movement of air during engine idling. This is accomplished by mating the spherical body 75 with the angled interior walls 81 of the hollowed portion 73. When the engine is turned on, vacuum pressure within the intake manifold 13 draws first piston member 53 against spring 59. Movement of first piston member 53 is sufficient to create enough vacuum within the receptacle body to draw second piston member to the position as shown. This movement also causes air to be drawn in from the air cleaner 15 through hose 49 which enters channel 44 of air intake port 43. It then passes through channel 83 of rod 65 and out apertures 85. Because of the design of second piston member 63 the air drawn in from air cleaner 15 is sufficient in force to momentarily depress pliable lip 69 thereby allowing air to pass over this lip and fill the receptacle body. As this is occurring, spherical body 75 maintains pressure against angled interior walls 81, prohibiting any escape of air to the carburetor. The respective positions of these components will remain unchanged providing the engine continues operating.

When the engines ignition is shut off, vacuum within the intake manifold is sufficiently decreased which in turn relieves the pressure against spring 59 by first piston member 53, allowing the spring to expand, as is shown in FIG. 3. This expansion causes second piston 63 to move to the position as shown and also forces the air located between the first and second piston members out through air passage 79, into hollowed portion 73 and into hose 47 where it will travel to idle fuel chamber 27, (shown in FIG. 1). The pressure exerted by this sudden onsurge of air is sufficient to force spherical body 75 upward against spring 77 and allow the air to pass by. Pliable lip 69 of stationary member 63 is designed such that this air pressure is not substantial enough to cause it to collapse, but instead to push with even greater force against the interior wall 38 of the receptacle body during its withdrawal period. Second piston member 63 moves beyond air passage 79 of air escape port 41 during engine idling, as shown in FIG. 2. Upon ignition shutoff, this member must pass back over air passage 79 during its return to the position as shown in FIG. 3. This brief period of travel during which no air will be forced from the receptacle body is essential to allow the compression created within the internal combustion engine to work against the momentum of the engine and sufficiently reduce its capability to continue operating so that this device can function properly.

The air then forced out of the antidieseling device and into the idle fuel chamber will provide an improper air to fuel ratio or better known to those in the art as a lean fuel mixture which, in turn, will be insufficient to burn once introduced into the engines cylinder compartments. This entire operation is designed to occur within as short a period as possible.

While there have been shown and described what are presently considered the preferred embodiments of this invention, it is obvious to those skilled in the art that various changes and modifications may be made therein without departing from the scope of the invention as defined by the following claims.

I claim:

1. A device to prevent dieseling in an internal combustion engine after ignition shutoff comprising:

a body having an air intake port and a vacuum port on opposing ends of said body, and an air escape port between said air intake port and said vacuum port;

a first piston member located within said body and adapted for movement between said air escape port and said vacuum port;

a second piston member located within said body and adapted to permit unidirectional air flow from said air intake port past said second piston member; and

means for providing movement to said first piston member whereby during operation of said engine, vacuum moves said first piston member toward said vacuum port and upon ignition shutoff said means moves said first piston member toward said air escape port. 2. The device according to clalm l m which said vacuum port is adapted for connecting to the intake manifold of said internal combustion engine.

3. The device according to claim 1 in which said air escape port is adapted for connecting to the idle fuel chamber of the carburetor of said internal combustion engine.

4. The device according to claim 1 in which said air intake port is adapted for connecting to said air cleaner of said internal combustion engine.

5. The device according to claim 1 in which said means for providing movement to said first piston member consists of a 

1. A device to Prevent dieseling in an internal combustion engine after ignition shutoff comprising: a body having an air intake port and a vacuum port on opposing ends of said body, and an air escape port between said air intake port and said vacuum port; a first piston member located within said body and adapted for movement between said air escape port and said vacuum port; a second piston member located within said body and adapted to permit unidirectional air flow from said air intake port past said second piston member; and means for providing movement to said first piston member whereby during operation of said engine, vacuum moves said first piston member toward said vacuum port and upon ignition shutoff said means moves said first piston member toward said air escape port.
 2. The device according to claim 1 in which said vacuum port is adapted for connecting to the intake manifold of said internal combustion engine.
 3. The device according to claim 1 in which said air escape port is adapted for connecting to the idle fuel chamber of the carburetor of said internal combustion engine.
 4. The device according to claim 1 in which said air intake port is adapted for connecting to said air cleaner of said internal combustion engine.
 5. The device according to claim 1 in which said means for providing movement to said first piston member consists of a resilient member attached at one end to the side of said first piston member and at the other end to the internal wall of said body.
 6. The device according to claim 5 in which said resilient member consists of a spring. 